Sounds very dodgy indeed. I've been looking for insurance quotes off the web over the past few weeks and I've had to leave a contact number in order to confirm quotes (I'd rather leave mob instead of home). I've been having calls to my mobile this week, haven't answered any of them. They never leave messages, only rings 5/6 times and when I call back 'sorry, we will call later'. Just ignore them, if they are that desperate to get in touch then genuine companies will write to you.